well, i can say with confidence that the likelihood of it happening is n that greenwich village rest vaaurant less thanu walking out of the restaurant getting hit by a bus. so it's a probability and risk. you can't be 100% risk free. >> do you worry that the growing human population combined with climate change will create an environment where outbreaks of ebola or other deadly pathogens will be more common in the future? >> theoretically, yes. probably the only thing that significant climate change might impact is the range of certain mosquitos, for example. there may be malaria, for example, if you take kenya as a nation, there are parts of kenya with high elevations and when you get above a certain elevation because of the temperature you don't have mosquitos so you don't have malaria there. you could imagine if you get a 1-degree increase the malaria range would increase so much. but i don't think that that's that important because if you really have so much of a climate change that would have mosquitos be all over the place through every season then there will be enough melting